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Production of a liquid separation module
| Details |
Inventors: Kanamaru, Naokatu; Imai, Kazuo; Fujino, Hisaaki;
Assignee: Toray Industries, Inc. (Tokyo, JP)
Primary Examiner: Spear, Jr.; Frank A.
Assistant Examiner:
Attorney, Agent or Firm: Finnegan, Henderson, Farabow & Garrett
Disclosed is a liquid separation module of a spiral type which is produced by a simple apparatus requiring no manual operations, so that a mandrel is provided with a spirally and tightly wound layer arrangement consisting of a plurality of layer elements without any abnormal relative shifting between any layer elements, without occurrence of wrinkles in any layer element and with uniform tightness of the winding along the radius of the wound layer arrangement. The layer arrangement is wound on the mandrel in such way that, while the layer arrangement is being tightly wound on the mandrel by rotating the mandrel with the forward end of the layer arragement fixed to the mandrel, a portion of the layer arrangement which has not yet been tightly wound is forced to bulge just before coming into tight contact with the mandrel or with another portion of the layer arrangement which has been tightly wound, so that at the bulged portion the layer elements are partially separated from each other. A preferable layer arrangement is prepared so that the layer elements are piled one on top of the other and a single sheet of permeable membrane is used as one of the layer elements, which is connected at the ends thereof to form a loop after completion of the winding process. |
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DETAILED DESCRIPTION What is claimed is: 1.
A method of producing a liquid separation module of a spiral type, having a mandrel with a layer arrangement, consisting of a plurality of layer elements, wherein said layer arrangement is tightly wound about said mandrel in such way that, while said layer arrangement is being spirally and tightly wound on said mandrel by rotating said mandrel with the forward end of said layer arrangement fixed to said mandrel, a portion of said layer arrangement which has not yet been tightly wound is forced to bulge in a direction, perpendicular to the surface of said layer arrangement, just before coming into tight contact with said mandrel or with another portion of said layer arrangement which has been tightly wound, so that at the bulged portion said layer elements are partially separated from each other.
2.
A method of producing a liquid separation module according to claim 1, wherein said layer arrangement is prepared in the form of a united sheet layer arrangement which, in a cross-sectional view consists of: one or a plurality of individual sheet layer arrangements, each consisting of a first membrane sheet, a first spacing layer for a first passage of a permeated solution, a second membrane sheet and a second spacing layer for a second passage of a feed solution disposed in that order; said first membrane sheet in each individual sheet layer arrangement being disposed on the outer surface of said second spacing layer in the neighbouring individual sheet layer arrangement; said united layer arrangement being spirally and tightly wound around said mandrel by rotating said mandrel with the forward end of at least one of said first spacing layers in said united layer arrangement fixed to said mandrel.
3.
A method of producing a liquid separation module according to claim 2, wherein a sheet of semipermeable membrane is used in each individual sheet layer arrangement to form said first and second membrane sheets connected over the entire width of the forward or rear ends thereof parallel to the axis of said mandrel
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Liquid Purification 
